❓ 题目 According to paragraph 2, which of the following is cited as evidence for the mid-20th century start of the Anthropocene?
- A. A) Elevated levels of carbon dioxide in ice cores from the Industrial Revolution.
- B. B) Distinct layers of sediment containing radioactive isotopes from nuclear tests.
- C. C) Widespread plastic pollution found in deep ocean sediments.
- D. D) Fossil records showing accelerated species extinction rates.